De Wolf, Erick and Dallas Seifers, Triticum Mosaic: A New Wheat Disease in Kansas, Manhattan, Kansas, Kansas State University, August 2008

De Wolf, Erick D.

Seifers, Dallas Lynn

K-State Research Exchange

The full distribution of triticum mosaic has not been determined, but the disease is known to occur in the western half of Kansas including Cheyenne, Ellis, Ford, Ness, Osborne, Pawnee, and Trego counties. To date, the Triticum mosaic is a wheat disease discovered by plant pathologist Dallas Seifers and wheat breeder Joe Martin at the KSU Agricultural Research Center - Hays. The disease was discovered in 2006 when the variety RonL, which is one of the first varieties to have high levels of genetic resistance to wheat streak mosaic, developed severe symptoms of viral disease. The virus infecting RonL and causing the symptoms is now recognized as Triticum mosaic virus (TriMV).SymptomsThe symptoms of wheat infected with triticum mosaic include light-green or yellow streaking, spotting, or mottling (Figure 1), and are nearly identical to the symp-toms of wheat infected with wheat streak mosaic or the high plains disease. The variety RonL is known to be susceptible to triticum mosaic, but additional evaluation is needed before the reaction of other varieties can be determined. Preliminary evaluation suggests that some wheat varieties grown in Kansas are moderately resistant to infection by the virus. However, when plants are infected with both triticum mosaic and wheat streak mosaic, the symptoms may become much more severe (Figure 2). Plants that are infected with both diseases may die prematurely and produce little or no grain. This type of reaction also occurs when plants are infected with wheat streak mosaic and the high plains disease.Triticum Mosaic:  A New Wheat Disease in Kansas	 Erick	De	Wolf,	Plant	Pathologist	 Dallas	Seifers,	Plant	PathologistKansas	State	University	Agricultural	Experiment	Station	and	Cooperative	Extension	ServicePlant Pathology  EP-145Figure 1. Symptoms of triticum mosaic include yellow streaking, spotting or mottling of leaves. These symptoms are very similar to those of wheat streak mosaic.Figure 2. Symptoms of wheat infected with wheat streak mosaic virus (WSMV), Triticum mosaic virus (TriMV), and plants infected with both Wheat streak mosaic virus and Triticum mosaic virus (WSMV+TriMV). Notice that plants infected with both viruses have greater disease severity.Quick Facts •	 Discovered in 2006, triticum mosaic is a new viral disease affecting wheat in Kansas.•	 The symptoms in wheat infected with triticum mosaic are virtually identical those of wheat infected with wheat streak mosaic and the high plains disease and include yellow streaking, spot-ting, or mottling.•	 Preliminary evaluation suggests that some wheat varieties may have moderate levels of resistance to triticum mosaic. However, severity of the disease is greater when plants are infected with both triticum mosaic and wheat streak mosaic. •	 Volunteer wheat is known to be a favorable host for the virus and the wheat curl mites that spread the virus. Eliminating volunteer wheat 2 weeks before planting greatly reduces the risk of severe triticum mosaic and wheat streak mosaic.Kansas State University Agricultural Experiment Station and Cooperative Extension ServiceEP-145 August 2008K-State Research and Extension is an equal opportunity provider and employer. Issued in furtherance of Cooperative Extension Work, Acts of May 8 and June 30, 1914, as amended. Kansas State University, County Extension Councils, Extension Districts, and United States Department of Agriculture Cooperating, Fred A. Cholick, Director.Brand names appearing in this publication are for product identification purposes only. No endorsement is intended, nor is criticism implied of similar products not mentioned. Persons using such products assume responsibility for their use in accordance with current label directions of the manufacturer.Publications from Kansas State University are available on the World Wide Web at: www.oznet.ksu.eduContents of this publication may be freely reproduced for educational purposes. All other rights reserved. In each case, credit  Erick De Wolf and Dallas Seifers, Triticum Mosaic: A New Wheat Disease in Kansas, Kansas State University, August 2008.virus appears to be rare in other areas of Kansas, but surveys are ongoing to more fully define the distribution of the disease.ControlThe management recommendations for triticum mosaic are nearly identical to those currently used to control wheat streak mosaic. The wheat curl mite spreads both viruses. Eliminating volunteer wheat, which is known to harbor large numbers of wheat curl mites and the viruses, can significantly reduce the risk of severe disease. Destroying these volunteers with herbicides or tillage at least 2 weeks before planting a new wheat crop will signifi-cantly reduce the risk of severe disease. 

Triticum mosaic: a new wheat disease in Kansas

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Triticum mosaic: a new wheat disease in Kansas

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